WMS:NSS Region Coverage
An NSS Region coverage can be generated so that regions can automatically be mapped to a drainage coverage when performing hydrologic analysis using the NSS regression equations. Individual state maps can be found at the USGS website: http://water.usgs.gov/software/NSS/ (Look at the bottom of the page and select your state). If you want to digitize the state, then download the image from the USGS website and save the picture as either a .tif or .jpg image (many times the default will be a .gif image) using any type of imaging software program. Load the .tif, or .jpg image into WMS and register according to the latitude and longitude coordinates found on the map, and then convert the coordinates to the coordinate system you will be delineating your watershed in. With the image in the background you can easily digitize the lines and build the polygons of the coverage. Finally assign the attributes (state and region) to the polygons and save it as a map file. This NSS coverage file can then be used for any watershed within the given state.
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